Commutator



y 1951 R. PERLIN! 2,562,572

COMMUTATORI Filed Jan. 11, 1949 [i -I 12 b 62 INSULATION Fl 75 I 76 lNVENTOR ROBERT PERL/NI /MeJX. W

ATTORNEY Patented July 31, 1951 UNITED STATES PATENT OFFICE COMMUTATOR Application January 11, 1949, Serial No. 70,164

2 Claims. 1

Thi invention relates to improvements in commutators or circuit breakers which are adapted for use in machines of the type shown in the co-pending application of Luhn, Brosio and Dean, Serial No. 794,530, filed December 30, 1947, for Data Comparing Apparatus.

The present invention has for its general objects the provision of a novel structural arrangement of commutator elements which is simple. inexpensive to manufacture and assemble, and adapted to be variably assembled to meet various commutating and circuit breaking requirements.

Further objects and advantages will be hereinafter pointed out in the accompanying specifications and claims which show by way of illustration what I now consider to be a preferred embodiment of the invention.

In the drawings:

Figure 1 shows an elevational view of one of the commutator metallic insert elements;

Fig. 2 shows an end elevational view of the complete commutator with inserts of Fig. 1 positioned therein;

Fig. 3 is a detailed sectional view taken on line 3-3 of Fig. 2 and looking in the direction of the arrows.

In more detail, the commutator wheel or circuit breaker which forms the subject-matter of the present invention comprises a Web 13 of insulating material, having a rim portion l4, also of insulating material, integral therewith. In the preferred form of the invention, the rim portion I4 is of greater axial width than the web 13, thereby providing a shouldered inner periphery at the junction of the web and rim. After the web l3 and the rim I4 have been fabricated by molding or otherwise, a plurality of radial slots are cut out therefrom by sawing or milling operations. One of these slots is shown at II in Fig. 2. The angular position of the slots will be dependent upon the angular position at which circuit making or commutating operations are to be established.

The slots l l are sawed out to such a depth that the bottom portion of the slot will extend below the rim and enter the web portion I3. Metallic inserts l constituting commutating elements having laterally extending slots b and b opening through the opposite side walls thereof as shown in Fig. 1 are provided for insertion into selected slots of the commutator wheel. In the embodiment illustrated in Fig. 2 such elements II! are inserted in all but one of the slots l I. It is obvious, however, that the commutating elements may be placed in desired slots and left out of desired slot depending upon the particular circuit making and breaking problem the device is to perform when in use.

After the inserts ID are fitted into the desired slots the ear or tab portions a, or a, are bent over at right angles to the general plane of the element ID as indicated in Figs. 2 and 3 and, when in this bent-over relation, the tabs 11 and a engage under the shouldered junction of the web I3 and the rim H to retain the elements 10 in assembled relation within the rim l4. Preferably one tab 0. is bent in one direction and the other tab a is bent in the opposite direction. i. e., at with respect to the bending of tab a, as shown in Fig. 3.

The subsequent fabrication of the commutator includes the fastening of the web I3 to a hub portion l5 which may be conveniently effected by suitable fastening means such as by screws l5 (see Fig. 2).

The final finishing of the commutator comprises the mounting of the hub portion on a shaft (not shown), this being effected by suitable keys, set screws, or the like (not shown). Thereafter the periphery of the commutator may be ground off or finished in a lathe so that the periphery of the commutator insulating rim H peripherally aligns with the outer edge of the metallic inserts Ill. The commutator is then ready for use.

What is claimed is:

1. A commutator comprising a web of insulating material provided with a rim portion integral therewith, said rim being wider in an axial direction than said web thereby forming a shouldered junction between said web and said rim, a plurality of radially extending slots formed at regular intervals about the circumference of said rim and web, metallic inserts in selected ones of said slots having turned over tab portions which engage said web and the shouldered portion at the junction of said web and rim to retain said elements in assembled relation with respect to said rim and web portions.

2. The invention according to claim 1 wherein the retaining tab portion of the metallic commutating inserts are bent in opposite directions with respect to the plane of the metallic commutating elements.

ROBERT PERLINI.

REFERENCES CITED UNITED STATES PATENTS Name Date Aufiero Mar. 31, 1942 Number 

